diff --git a/src/handlers/processControl.js b/src/handlers/processControl.js
index 9655621..8edcc80 100644
--- a/src/handlers/processControl.js
+++ b/src/handlers/processControl.js
@@ -77,8 +77,8 @@ export class ProcessControl {
       // Open issue: https://github.com/codex-storage/nim-codex/issues/1206
       // So we're setting them here.
       "persistence",
-      `--eth-provider=https://rpc.testnet.codex.storage`,
-      `--eth-private-key=eth.key`
+      `--eth-provider=${this.codexGlobals.getEthProvider()}`,
+      `--eth-private-key=eth.key`, // duplicated in configService.
     ];
     await this.shell.spawnDetachedProcess(executable, workingDir, args);
   };
diff --git a/src/main.js b/src/main.js
index 4dfc13a..c10ebcb 100644
--- a/src/main.js
+++ b/src/main.js
@@ -109,7 +109,12 @@ export async function main() {
   const configService = new ConfigService(fsService, osService);
   const codexApp = new CodexApp(configService);
   const pathSelector = new PathSelector(uiService, new MenuLoop(), fsService);
-  const ethersService = new EthersService(fsService, configService);
+  const ethersService = new EthersService(
+    fsService,
+    configService,
+    osService,
+    shellService,
+  );
   const marketplaceSetup = new MarketplaceSetup(
     uiService,
     configService,
diff --git a/src/services/codexGlobals.js b/src/services/codexGlobals.js
index d3344f2..1c2ac57 100644
--- a/src/services/codexGlobals.js
+++ b/src/services/codexGlobals.js
@@ -13,5 +13,5 @@ export class CodexGlobals {
 
   getEthProvider = () => {
     return "https://rpc.testnet.codex.storage";
-  }
+  };
 }
diff --git a/src/services/configService.js b/src/services/configService.js
index c287fa2..84d0d7e 100644
--- a/src/services/configService.js
+++ b/src/services/configService.js
@@ -94,22 +94,18 @@ export class ConfigService {
     this.fs.writeFile(
       this.getCodexConfigFilePath(),
       `data-dir="${datadir}"${nl}` +
-      `log-level="TRACE"${nl}` +
-      `log-file="${codexLogFile}"${nl}` +
-      `storage-quota=${this.config.storageQuota}${nl}` +
-      `disc-port=${this.config.ports.discPort}${nl}` +
-      `listen-addrs=["/ip4/0.0.0.0/tcp/${this.config.ports.listenPort}"]${nl}` +
-      `api-port=${this.config.ports.apiPort}${nl}` +
-      `nat="extip:${publicIp}"${nl}` +
-      `api-cors-origin="*"${nl}` +
-      `bootstrap-node=[${bootNodes}]${nl}` +
-      // Marketplace client parameters:
-      // `[persistence]${nl}` +
-      //`eth-provider="${ethProvider}"${nl}` +
-      // `eth-provider="https://rpc.testnet.codex.storage"${nl}` +
-      // //`eth-private-key="${ethKeyFile}"${nl}` + 
-      // `eth-private-key="notafile.no"${nl}` + 
-      `${nl}`
+        `log-level="TRACE"${nl}` +
+        `log-file="${codexLogFile}"${nl}` +
+        `storage-quota=${this.config.storageQuota}${nl}` +
+        `disc-port=${this.config.ports.discPort}${nl}` +
+        `listen-addrs=["/ip4/0.0.0.0/tcp/${this.config.ports.listenPort}"]${nl}` +
+        `api-port=${this.config.ports.apiPort}${nl}` +
+        `nat="extip:${publicIp}"${nl}` +
+        `api-cors-origin="*"${nl}` +
+        `bootstrap-node=[${bootNodes}]${nl}` +
+        // Marketplace client parameters cannot be set via config file.
+        // Open issue: https://github.com/codex-storage/nim-codex/issues/1206
+        `${nl}`,
     );
   };
 }
diff --git a/src/services/ethersService.js b/src/services/ethersService.js
index abb1352..870a39b 100644
--- a/src/services/ethersService.js
+++ b/src/services/ethersService.js
@@ -1,10 +1,12 @@
-import { ethers } from 'ethers';
+import { ethers } from "ethers";
 import crypto from "crypto";
 
 export class EthersService {
-  constructor(fsService, configService) {
+  constructor(fsService, configService, osService, shellService) {
     this.fs = fsService;
     this.configService = configService;
+    this.os = osService;
+    this.shell = shellService;
   }
 
   getOrCreateEthKey = () => {
@@ -27,6 +29,14 @@ export class EthersService {
     const keys = this.generateKey();
     this.fs.writeFile(paths.key, keys.key);
     this.fs.writeFile(paths.address, keys.address);
+
+    if (this.os.isWindows()) {
+      const username = this.os.getUsername();
+      this.shell.run(`icacls ${paths.key} /inheritance:r >nul 2>&1`);
+      this.shell.run(`icacls ${paths.key} /grant:r ${username}:F >nul 2>&1`);
+    } else {
+      this.shell.run(`chmod 600 "${paths.key}"`);
+    }
   };
 
   generateKey = () => {
diff --git a/src/services/osService.js b/src/services/osService.js
index f3b4449..aa05d71 100644
--- a/src/services/osService.js
+++ b/src/services/osService.js
@@ -33,4 +33,8 @@ export class OsService {
   terminateProcess = (pid) => {
     process.kill(pid, "SIGTERM");
   };
+
+  getUsername = () => {
+    return os.userInfo().username;
+  };
 }